OH OH QH CNO 7 no nO2 O2N OH NO 2 p/a715 722 8.39 4.09 NO OH 2 (CH3)3CCH2 CH2 C(CH3)3 OH NO 2 CH2C(CH3)3 oka 0.25 酸性极弱> OH NO2 OH NO2 OH NO2 O2N > OH NO2 pka 7.15 7.22 8.39 4.09 NO2 OH NO2 O2N OH CH2C(CH3 )3 CH2C(CH3 )3 (CH3 )3CCH2 pka 0.25 酸性极弱